90185143 has 2 divisors, whose sum is σ = 90185144. Its totient is φ = 90185142.

The previous prime is 90185111. The next prime is 90185189. The reversal of 90185143 is 34158109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90185143 - 2⁵ = 90185111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90185443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45092571 + 45092572.

It is an arithmetic number, because the mean of its divisors is an integer number (45092572).

Almost surely, 2^90185143 is an apocalyptic number.

90185143 is a deficient number, since it is larger than the sum of its proper divisors (1).

90185143 is an equidigital number, since it uses as much as digits as its factorization.

90185143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 90185143 is about 9496.5858601921. The cubic root of 90185143 is about 448.4475607410.

It can be divided in two parts, 9018 and 5143, that added together give a square (14161 = 119²).

The spelling of 90185143 in words is "ninety million, one hundred eighty-five thousand, one hundred forty-three".